24
Dead Band
Use the arrow keys to set the desired dead band, then press
ENTER.
If the set point
is 2.50 g/L, and the dead band is 0.05 g/L, then the relay will close at 2.50 g/L and
open 0.05 g/L away from 2.50 g/L (2.55 g/L if set for EC, 2.45 g/L if set for
microetch).
Time Limit
Use the arrow keys to set the time limit for the output to be active, then press
ENTER.
Since all outputs are turned on at the same time for control purposes, the
time limit set applies to outputs 2, 3 and 4 also. If it is set for "0:00", no limit will be
imposed and the output could stay on forever.
Interlock
Use the Up and Down arrows to toggle between Y(Yes) and N(No). Choosing Y
means that the output will deactivate depending on the state of the device attached to
the controller. If the device is open, the interlock condition exists and control is
stopped. For example, if the sensor is installed in a recirculating pipe line, a flow
switch that is closed if flow is sufficient and open if flow is insufficient may be
installed in the line, so that if flow past the sensor stops, the controller will not pump
in chemicals based on a stagnant sample.
An interlock condition disables all outputs.
Reset Timer
This menu appears when the programmed time limit has elapsed, creating a pump
overrun condition. Use this menu to reset the timer. This applies to all outputs.
H O A
Use the Left and Right arrows to move between Hand, Off and Auto (H O A). In
Hand (Manual) mode, the output will be turned on immediately for a maximum of
10 minutes. In the Off mode, the output will be turned off indefinitely. In the Auto
mode, the output turns on and off in response to changes in the process value
relative to the set point. The letter inside the block on the status screen indicates
which mode the output is in.
